Sea To Summit Silk Blend Sleeping Bag Liner, designed primarily for comfort, adds warmth to your sleeping bag via the 72% Thermolite Pro yarns with infra red technology, Thermolite EcoMade fibres and 28% silk. The combination creates a soft, luxurious sleep environment.   Features: A liner is the climate core of your sleep system. Rectangular with Pillow Sleeve is a great hygienic sleep sheet wherever you travel HeiQ odour control technology helps keep the liner fresh even after extended use Sea To Summit Silk Blend Rectangular Sleeping Bag Liner